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                    对象的扩展
            
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                    原型继承
            
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                    模块化Module
            
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                    js 扩展
            
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                    浏览器对象
            
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                    操作文件
            
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                    AJAX
            
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                    修改DOM结构
            
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                    事件
            
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                    动画
            
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                    AJAX
            
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                    扩展
            
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                    Nodejs
            
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                    模块
            
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                    path
            
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                    zlib压缩解压缩
            
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                    express框架
            
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                    process 进程
            
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                    React
            
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                                <h1 id="os-&#x64CD;&#x4F5C;&#x7CFB;&#x7EDF;">os-&#x64CD;&#x4F5C;&#x7CFB;&#x7EDF;</h1>
<p><code>os</code>&#x6A21;&#x5757;&#x63D0;&#x4F9B;&#x4E86;&#x64CD;&#x4F5C;&#x7CFB;&#x7EDF;&#x76F8;&#x5173;&#x7684;&#x5B9E;&#x7528;&#x65B9;&#x6CD5;&#x3002;</p>
<p>&#x5F15;&#x5165;<code>os</code>&#x6A21;&#x5757;:</p>
<pre><code class="lang-js"><span class="hljs-keyword">const</span> os = <span class="hljs-built_in">require</span>(<span class="hljs-string">&quot;os&quot;</span>);
</code></pre>
<h3 id="oseol">os.EOL</h3>
<p>&#x83B7;&#x53D6;&#x7CFB;&#x7EDF;&#x7684;&#x6362;&#x884C;&#x7B26;&#xFF1A;</p>
<pre><code class="lang-js"><span class="hljs-keyword">const</span> eol = os.EOL;
<span class="hljs-built_in">console</span>.log(<span class="hljs-string">`!!<span class="hljs-subst">${eol}</span>!!`</span>);
</code></pre>
<p>&#x8F93;&#x51FA;&#xFF1A;</p>
<pre><code class="lang-shell">!!
!!
</code></pre>
<hr>
<h3 id="oscpus">os.cpus()</h3>
<p>&#x8FD4;&#x56DE;&#x4E00;&#x4E2A;&#x5BF9;&#x8C61;&#x6570;&#x7EC4;&#xFF0C;&#x5305;&#x542B;&#x4E86;cpu&#x5185;&#x6838;&#x7684;&#x4FE1;&#x606F;&#x3002;</p>
<p>&#x5982;&#xFF1A;</p>
<pre><code class="lang-js"><span class="hljs-keyword">const</span> cpus = os.cpus();
</code></pre>
<p>&#x6211;&#x7684;&#x673A;&#x5B50;&#x662F;6&#x6838;&#x7684;&#xFF0C;&#x6240;&#x4EE5;&#x5927;&#x5C0F;&#x4E3A;&#x6570;&#x7EC4;&#x5927;&#x5C0F;&#x4E3A;6&#x3002;</p>
<pre><code class="lang-shell">[ { model: &apos;Intel(R) Core(TM) i5-8500 CPU @ 3.00GHz&apos;,
    speed: 1270,
    times:
     { user: 2106200, nice: 37300, sys: 492100, idle: 28660300, irq: 0 } },
  { model: &apos;Intel(R) Core(TM) i5-8500 CPU @ 3.00GHz&apos;,
    speed: 2060,
    times:
     { user: 2278600, nice: 81800, sys: 554800, idle: 28106700, irq: 0 } },
  { model: &apos;Intel(R) Core(TM) i5-8500 CPU @ 3.00GHz&apos;,
    speed: 1244,
    times:
     { user: 2144000, nice: 65800, sys: 477800, idle: 28601000, irq: 0 } },
  { model: &apos;Intel(R) Core(TM) i5-8500 CPU @ 3.00GHz&apos;,
    speed: 1142,
    times:
     { user: 2099000, nice: 13400, sys: 484800, idle: 28689800, irq: 0 } },
  { model: &apos;Intel(R) Core(TM) i5-8500 CPU @ 3.00GHz&apos;,
    speed: 943,
    times:
     { user: 2033100, nice: 27500, sys: 462400, idle: 28703800, irq: 0 } },
  { model: &apos;Intel(R) Core(TM) i5-8500 CPU @ 3.00GHz&apos;,
    speed: 1578,
    times:
     { user: 2095400, nice: 20400, sys: 524100, idle: 28600800, irq: 0 } } ]
</code></pre>
<hr>
<h3 id="osfreemem">os.freemem()</h3>
<p>&#x4EE5;&#x6574;&#x6570;&#x7684;&#x5F62;&#x5F0F;&#x8FD4;&#x56DE;&#x7A7A;&#x95F2;&#x7CFB;&#x7EDF;&#x5185;&#x5B58;&#x7684;&#x5B57;&#x8282;&#x6570;&#x3002;</p>
<pre><code class="lang-js"><span class="hljs-keyword">const</span> freemem = os.freemem(); <span class="hljs-comment">// =&gt; 538521600</span>
</code></pre>
<hr>
<h3 id="ostotalmem">os.totalmem()</h3>
<p>&#x4EE5;&#x6574;&#x6570;&#x7684;&#x5F62;&#x5F0F;&#x8FD4;&#x56DE;&#x7CFB;&#x7EDF;&#x5185;&#x5B58;&#x603B;&#x91CF;&#x7684;&#x5B57;&#x8282;&#x6570;&#x3002;</p>
<pre><code class="lang-js"><span class="hljs-keyword">const</span> totalmem = os.totalmem(); <span class="hljs-comment">// =&gt;8178692096</span>
</code></pre>
<hr>
<h3 id="osgetprioritypid">os.getPriority([pid])</h3>
<p>&#x8FD4;&#x56DE;&#x7531;pid&#x6307;&#x5B9A;&#x7684;&#x8FDB;&#x7A0B;&#x7684;&#x8C03;&#x5EA6;&#x4F18;&#x5148;&#x7EA7;&#x3002;&#x5982;&#x679C;pid&#x672A;&#x6307;&#x5B9A;&#x6216;&#x8005;&#x7B49;&#x4E8E;0&#xFF0C;&#x90A3;&#x4E48;&#x8FD4;&#x56DE;&#x5F53;&#x524D;&#x8FDB;&#x7A0B;&#x7684;&#x4F18;&#x5148;&#x7EA7;&#x3002;</p>
<pre><code class="lang-js"><span class="hljs-keyword">const</span> priority = os.getPriority(); <span class="hljs-comment">// =&gt; 0</span>
</code></pre>
<hr>
<h3 id="ossetprioritypidpriority">os.setPriority([pid,]priority)</h3>
<p>&#x4E3A;pid&#x8FDB;&#x7A0B;&#x8BBE;&#x7F6E;&#x8C03;&#x5EA6;&#x4F18;&#x5148;&#x7EA7;&#x3002;pid&#x9ED8;&#x8BA4;&#x662F;0&#xFF0C;&#x5373;&#x5F53;&#x524D;&#x8FDB;&#x7A0B;&#x3002;priority&#x8F93;&#x5165;&#x7684;&#x8303;&#x56F4;&#x4E3A;-20&#xFF08;&#x9AD8;&#x4F18;&#x5148;&#x7EA7;)&#x548C;19&#xFF08;&#x4F4E;&#x4F18;&#x5148;&#x7EA7;&#xFF09;&#x4E4B;&#x95F4;&#x7684;&#x6574;&#x6570;&#x3002;&#x7531;&#x4E8E; Unix &#x4F18;&#x5148;&#x7EA7;&#x548C; Windows &#x4F18;&#x5148;&#x7EA7;&#x4E4B;&#x95F4;&#x7684;&#x5DEE;&#x5F02;&#xFF0C; <code>priority</code> &#x4F1A;&#x88AB;&#x6620;&#x5C04;&#x5230; <code>os.constants.priority</code> &#x4E2D;&#x7684;&#x516D;&#x4E2A;&#x4F18;&#x5148;&#x7EA7;&#x5E38;&#x91CF;&#x4E4B;&#x4E00;&#x3002; &#x5F53;&#x68C0;&#x7D22;&#x8FDB;&#x7A0B;&#x4F18;&#x5148;&#x7EA7;&#x65F6;&#xFF0C;&#x6B64;&#x8303;&#x56F4;&#x7684;&#x6620;&#x5C04;&#x53EF;&#x80FD;&#x5BFC;&#x81F4; Windows &#x4E0A;&#x7684;&#x8FD4;&#x56DE;&#x503C;&#x7565;&#x6709;&#x4E0D;&#x540C;&#x3002; &#x4E3A;&#x907F;&#x514D;&#x6DF7;&#x6DC6;&#xFF0C;&#x5EFA;&#x8BAE;&#x5C06; <code>priority</code> &#x8BBE;&#x7F6E;&#x4E3A;&#x5176;&#x4E2D;&#x4E00;&#x4E2A;&#x4F18;&#x5148;&#x7EA7;&#x5E38;&#x91CF;&#x3002;</p>
<p><code>os.constants</code>&#x8FD4;&#x56DE;&#x64CD;&#x4F5C;&#x7CFB;&#x7EDF;&#x7279;&#x5B9A;&#x5E38;&#x91CF;&#x7684;&#x5BF9;&#x8C61;,&#x5176;&#x4E2D;&#x5C31;&#x6709;&#x8FDB;&#x7A0B;&#x4F18;&#x5148;&#x7EA7;&#x6570;&#x7684;&#x5E38;&#x91CF;&#x3002;&#x6709;&#x4EE5;&#x4E0B;&#x5E38;&#x91CF;&#xFF1A;</p>
<pre><code class="lang-shell">{
  &quot;PRIORITY_LOW&quot;: 19,
  &quot;PRIORITY_BELOW_NORMAL&quot;: 10,
  &quot;PRIORITY_NORMAL&quot;: 0,
  &quot;PRIORITY_ABOVE_NORMAL&quot;: -7,
  &quot;PRIORITY_HIGH&quot;: -14,
  &quot;PRIORITY_HIGHEST&quot;: -20
}
</code></pre>
<hr>
<h3 id="oshomedir">os.homedir()</h3>
<p>&#x8FD4;&#x56DE;&#x5F53;&#x524D;&#x7528;&#x6237;&#x7684;&#x4E3B;&#x76EE;&#x5F55;&#x3002;</p>
<pre><code class="lang-js"><span class="hljs-keyword">const</span> homedir = os.homedir(); <span class="hljs-comment">// =&gt; &quot;/home/veng&quot;</span>
</code></pre>
<hr>
<h3 id="ostmpdir">os.tmpdir()</h3>
<p>&#x8FD4;&#x56DE;&#x64CD;&#x4F5C;&#x7CFB;&#x7EDF;&#x7684;&#x9ED8;&#x8BA4;&#x4E34;&#x65F6;&#x6587;&#x4EF6;&#x76EE;&#x5F55;&#x3002;</p>
<pre><code class="lang-js"><span class="hljs-keyword">const</span> tmpdir = os.tmpdir(); <span class="hljs-comment">// =&gt; &quot;/tmp&quot;</span>
</code></pre>
<hr>
<h3 id="oshostname">os.hostname()</h3>
<p>&#x8FD4;&#x56DE;&#x64CD;&#x4F5C;&#x7CFB;&#x7EDF;&#x7684;&#x4E3B;&#x673A;&#x540D;&#x3002;</p>
<pre><code class="lang-js"><span class="hljs-keyword">const</span> hostname = os.hostname(); <span class="hljs-comment">// =&gt; &quot;veng-OptiPlex-3060&quot;</span>
</code></pre>
<hr>
<h3 id="osnetworkinterfaces">os.networkInterfaces()</h3>
<p>&#x8FD4;&#x56DE;&#x672C;&#x673A;&#x7684;&#x7F51;&#x7EDC;&#x5730;&#x5740;&#x7684;&#x4FE1;&#x606F;&#x3002;</p>
<pre><code class="lang-js"><span class="hljs-keyword">const</span> networkInterfaces = os.networkInterfaces();
</code></pre>
<pre><code class="lang-shell">{
  &quot;lo&quot;: [
    {
      &quot;address&quot;: &quot;127.0.0.1&quot;,
      &quot;netmask&quot;: &quot;255.0.0.0&quot;,
      &quot;family&quot;: &quot;IPv4&quot;,
      &quot;mac&quot;: &quot;00:00:00:00:00:00&quot;,
      &quot;internal&quot;: true,
      &quot;cidr&quot;: &quot;127.0.0.1/8&quot;
    },
    {
      &quot;address&quot;: &quot;::1&quot;,
      &quot;netmask&quot;: &quot;ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff&quot;,
      &quot;family&quot;: &quot;IPv6&quot;,
      &quot;mac&quot;: &quot;00:00:00:00:00:00&quot;,
      &quot;scopeid&quot;: 0,
      &quot;internal&quot;: true,
      &quot;cidr&quot;: &quot;::1/128&quot;
    }
  ],
  &quot;enp1s0&quot;: [
    {
      &quot;address&quot;: &quot;10.18.139.173&quot;,
      &quot;netmask&quot;: &quot;255.255.255.0&quot;,
      &quot;family&quot;: &quot;IPv4&quot;,
      &quot;mac&quot;: &quot;e4:54:e8:9a:49:00&quot;,
      &quot;internal&quot;: false,
      &quot;cidr&quot;: &quot;10.18.139.173/24&quot;
    },
    {
      &quot;address&quot;: &quot;2001:620::4d4d:dfff:d0b8:1fef&quot;,
      &quot;netmask&quot;: &quot;ffff:ffff:ffff:ffff::&quot;,
      &quot;family&quot;: &quot;IPv6&quot;,
      &quot;mac&quot;: &quot;e4:54:e8:9a:49:00&quot;,
      &quot;scopeid&quot;: 0,
      &quot;internal&quot;: false,
      &quot;cidr&quot;: &quot;2001:620::4d4d:dfff:d0b8:1fef/64&quot;
    },
    {
      &quot;address&quot;: &quot;2001:620::e05a:79a1:ab1e:b4f2&quot;,
      &quot;netmask&quot;: &quot;ffff:ffff:ffff:ffff::&quot;,
      &quot;family&quot;: &quot;IPv6&quot;,
      &quot;mac&quot;: &quot;e4:54:e8:9a:49:00&quot;,
      &quot;scopeid&quot;: 0,
      &quot;internal&quot;: false,
      &quot;cidr&quot;: &quot;2001:620::e05a:79a1:ab1e:b4f2/64&quot;
    },
    {
      &quot;address&quot;: &quot;fe80::dfa:f782:df3f:bc03&quot;,
      &quot;netmask&quot;: &quot;ffff:ffff:ffff:ffff::&quot;,
      &quot;family&quot;: &quot;IPv6&quot;,
      &quot;mac&quot;: &quot;e4:54:e8:9a:49:00&quot;,
      &quot;scopeid&quot;: 2,
      &quot;internal&quot;: false,
      &quot;cidr&quot;: &quot;fe80::dfa:f782:df3f:bc03/64&quot;
    }
  ]
}
</code></pre>
<hr>
<h3 id="osplatform">os.platform()</h3>
<p>&#x8FD4;&#x56DE;node.js&#x7F16;&#x8BD1;&#x65F6;&#x7684;&#x64CD;&#x4F5C;&#x7CFB;&#x7EDF;&#x5E73;&#x53F0;&#x3002;</p>
<pre><code class="lang-js"><span class="hljs-keyword">const</span> platform = os.platform(); <span class="hljs-comment">// =&gt; &quot;linux&quot;</span>
</code></pre>

                                
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